The R factor or RTF is the shortened form of Resistance Transfer Factor and it is an old name for the plasmid that is responsible for antibiotic resistance. It was first isolated from a bacterium known as Shigella by a group of Japanese scientists in 1959.
A single R-factor typically codes for many antibiotic resistance factors. These R-factors can be passed from one bacterial cell to the other by the phenomenon of conjugation. This is the most common mean by which resistance to antibiotics is spread between various species.
There is a plasmid known as RP1 which is responsible for encoding resistance against various antibiotics like ampicillin, kanamycin, and tetracycline. This factor was first identified in Pseudomonas but can also be maintained in E. coli.
Meiotic nondisjunction is much more likely than mitotic nondisjunction. Based on
A woman who is heterozygous, Bb, has brown eyes;
Explain why familial breast cancer shows a dominant pattern of inheritance in
How is an F′ factor different from an F factor?
With regard to the timing of conjugation, explain why the recipient
The raw material for evolution is random mutation. Discuss whether or
Why is an antibody used in this experiment? From
Explain the type of speciation (allopatric, parapatric, or sympatric
In fruit flies, curved wings are recessive to straight wings,
A recessive allele in mice results in an unusally long neck.
